Review on High-Quality Water Hose Fitting Replacement for BMW 335i N54 N53 N52 Engines - 11537541992 11537544638 by Mike Pettigrew

Ideal for 2009 BMW 328i E91 with N52K engine. Both aluminum and workmanship appear to be excellent. The package came with the fitting itself, an o-ring and a hose clamp. Installation was a breeze: - removed broken plastic fitting, leaving old seal ring from cylinder head bore - seal ring installed - ring on fitting and lubricated with water - position fitting by hand correctly on cylinder head opening - apply even force to fitting - it is seated in the cylinder head bore with light-tight screws. I couldn't find the tightening torque for the screws. - attach the hose to the fitting and secure with a worm drive clamp.